Patents
Sitemap › C07 - Organic chemistry › C07D - Heterocyclic compounds › C07D 205 - Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom
Patents for C07D 205 - Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom (6,868)
12/1990
12/27/1990EP0404586A2 Nitrogen deprotected 4-acyloxyazetidin-2-ones
12/27/1990EP0404585A2 Process for the preparation of 4-acyloxyazetidin-2-one by singlet oxygen oxidation
12/27/1990EP0404584A2 Oxidation and reduction method to produce 4-acyloxyazetidin-2-one
12/27/1990EP0404583A2 Process for the preparation of 4-acyloxyazetidin-2-one by electrochemical methods
12/27/1990EP0404267A1 Improved synthesis of beta-lactams using a metal compound
12/27/1990CA1278302C Process for preparing 4-acetoxy-3- hydroxyethylazetidin-2-one derivatives
12/27/1990CA1278295C Beta-lactams and their production
12/22/1990CA2019619A1 Synthesis of beta-lactams using a metal compound
12/21/1990CA2019484A1 Nitrogen deprotected 4-acyloxyazetidin-2-ones
12/21/1990CA2019483A1 Oxidation and reduction method to produce 4-acyloxyazetidin-2-one
12/21/1990CA2019482A1 Process for the preparation of 4-acyloxyazetidin-2-one by electrochemical methods
12/21/1990CA2019479A1 Process for the preparation of 4-acyloxyazetidin-2-one by singlet oxygen oxidation
12/12/1990EP0401623A1 Process for the preparation of 7-(3-amino- and 3-aminomethyl-1-pyrrolidinyl)-3-quinolinonecarboxylic and -naphthyridinonecarboxylic acids
12/11/1990US4976834 Asymmetric photochemical reaction process
12/11/1990CA1277659C Tricyclic pyridine derivatives
12/05/1990EP0400971A2 Method for preparation of taxol
11/1990
11/27/1990US4973687 Synthesis of carbapenems using N-substituted azetidinones
11/22/1990EP0398326A2 Serotonin antagonist
11/22/1990EP0397857A1 $g(b)-AMINO-$g(b)-PROPIOLACTAM DERIVATIVES AND MOISTURE-CURABLE POLYURETHANE COMPOSITION PREPARED THEREFROM
11/22/1990DE3916364A1 New oxalic acid azetidine half amide derivs.
11/20/1990CA1276616C Catalyst for vapor-phase intramolecular dehydration reaction of alkanolamines
11/20/1990CA1276615C Catalyst for vapor-phase intermolecular dehydration reaction of alkanolamines
11/13/1990CA1276156C Enantioselective process for producing 1-beta- methylcarbapenem antibiotic intermediates
11/06/1990CA1276014C 2-heterocyclylthio penems
10/1990
10/31/1990EP0395312A2 Piperazine derivatives
10/31/1990CN1046523A Fungicides
10/30/1990US4966979 Process for synthesis of azetidine and novel intermediates therefor
10/23/1990US4965371 Selective cyclization process
10/16/1990US4963670 Preparation of azetidinones via novel protected intermediates
10/09/1990US4962209 Dihydropyran derivatives
10/09/1990US4962196 (3S, 4R)-3,4-trans-disubstituted azetidin-2-one intermediates
10/02/1990US4960880 Alkenylsilylazetidinone intermediates for carbapenems
10/02/1990US4960879 Process for carbapenem intermediates
10/02/1990US4960776 Antiallergens
09/1990
09/26/1990EP0389064A2 Process for the preparation of 3-exomethylenecepham sulfoxide derivatives and intermediates therefor
09/19/1990EP0388298A2 Derivatives of pyridone carboxylic acids substituted by an azetidine, their preparation and their use as medicines
09/19/1990CN1009644B Process for vapor-phase intramolecular dehydration reaction of alkanolamines
09/18/1990US4957912 7 acylamidocarbacephem antibacterial agents
09/18/1990CA1274176A1 Therapeutic compositions containing carboxylic azetidine derivatives
09/16/1990CA2012223A1 Substituted azetidinylpyridonecarboxylic acid derivatives, their preparation and their application as medicinal products
09/11/1990US4956359 Carboxamides or thiocarboxamides of aryl oxy or thio azetidines
09/11/1990CA1273938A1 O-SULFATED .beta.-LACTAM HYDROXAMIC ACIDS
08/1990
08/28/1990US4952690 6-substituted thia-aza compounds
08/28/1990US4952689 3-(substituted propylidene)-2-azetidinone derivates for blood platelet aggregation
08/28/1990US4952288 From 4-furanylazetidin-2-one by oxidation with bromine and sodium chlorite and reaction with organic acid
08/14/1990US4948898 Process for the manufacture of 1-sulpho-2-oxoazetidine derivatives
08/14/1990US4948885 Intermediates for antibacterial penems
08/08/1990EP0381330A1 Fungicides
08/07/1990US4946839 Azetidine derivatives, compositions and methods of treating
08/07/1990US4946838 Bactericides having stability and hydrophobic
08/02/1990DE4001087A1 Verwendung von (alpha)-aminofluoroketonen zur behandlung von cardiovaskulaeren stoerungen und erhoehtem blutdruck Use of (alpha) -aminofluoroketonen for treatment of cardiovaskulaeren disorders and an elevated blood pressure
08/02/1990CA2008291A1 Fungicides
07/1990
07/31/1990US4944789 Azetidine derivative and their use for regulating plant growth
07/24/1990US4943641 Reacting protected 3-sulfonyloxyazetidine with alkali metal phthalimide, then hydrazine and catalytic hydrogenation
07/24/1990US4943633 Catalytic preparation of cyanoalkyl lactams
07/24/1990US4943569 B-lactam compounds
07/17/1990US4942176 N-substituted aminoalkanoic acids, a process for their preparation, their use and pharmaceutical products based on these compounds
07/17/1990CA1271750A1 3-acylamino-2-oxo-1-azetidinesulfonic acids
07/17/1990CA1271749A1 Hydrazide derivatives of monocyclic .beta.-lactam antibiotics
07/10/1990US4940788 Process for preparing azetidinones
07/10/1990US4940520 Process for the preparation of 4-acyloxyazetidin-2-one by singlet oxygen oxidation
07/03/1990US4939253 2-oxoazetidin-1-yloxy acetic acids and analogs
07/03/1990US4939249 Process for 1-carba(dethia) cephalosporins
07/03/1990US4939248 Optically active azetidinones
06/1990
06/27/1990EP0375527A1 N-aryl-azetidinones, process for their preparation and their use as elastase inhibitors
06/20/1990EP0373448A1 Intermediate compounds for preparing penems and carbapanems
06/19/1990CA2005759A1 N-aryl-azetidinones, their preparation process and their use as elastase inhibitors
06/19/1990CA1270491A1 Azetidine compounds, their preparation, compositions containing them, method of producing f.sub.1 hybrid seed and f.sub.1 hybrid seed thus prepared
06/14/1990WO1990006316A1 Intermediate compounds for preparing penems and carbapenems
06/13/1990EP0372699A1 Process for the preparation of 4-acyloxy-2-azetidinone derivatives
06/12/1990US4933333 β-lactam compounds
06/12/1990CA1270247A1 3-acylamino-2-oxo-1-azetidinesulfonic acids
06/06/1990EP0371875A2 Process for preparing 4-acetoxyazetidinones
06/05/1990US4931555 Disulfide substituted oxazetidine derivatives
06/05/1990CA2004355A1 Process for intermediate compounds for preparing penems and carbapenems
06/05/1990CA1270097A1 Substituted azetidinone compounds
05/1990
05/30/1990EP0371004A1 [(1-Alkoxy-1-methyl)-ethoxy]-amines, their preparation and their use for the preparation of 3-acylamino-1-hydroxy-2-azetidinones
05/23/1990EP0369691A2 Process for preparing optically active 3-hydroxybutanoic acid
05/22/1990US4927980 Reacting chloroaromatic compound with alkali metal fluoride salts
05/22/1990US4927507 Antibiotic intermediate
05/22/1990CA1269388A1 .beta.-lactam compound and preparing thereof
05/09/1990EP0367722A1 Process for preparing optically active acyloxyazetidinones
05/09/1990CN1041944A Process for preparation of penems
05/08/1990US4923982 Oxidation and reduction method to produce 4-acyloxyazetidin-2-one
05/08/1990CA1268780A2 N-hydroxyl protecting groups and process for the preparation of 3-acylamino-1-hydroxy-2-azetidinones
05/08/1990CA1268759A1 Copper-mediated oximation reaction
05/04/1990CA2002045A1 Process for the preparation of optically active acyloxyazetidinones
05/02/1990EP0366193A2 Novel antimicrobial quinolonyl lactams
04/1990
04/25/1990EP0365364A2 2-Azetidinone derivatives
04/25/1990EP0365223A2 Process for the preparation of penems
04/25/1990EP0365190A1 Azetidinone intermediates to carbacephalosporins and process
04/25/1990CN1041593A Process for 1-carba (dethia) cephalosporins
04/25/1990CA1268183C Phosphorane intermediates for use in preparing penem antibiotics
04/20/1990CA2000437A1 2-azetidinone derivatives
04/18/1990EP0364033A2 Stereoselective process for producing 1-beta-methylcarbapenem antibiotic intermediates
04/17/1990US4918188 Intermediates for penicillin and carbapenicillin antibiotics
04/17/1990US4918185 Process for carbon-carbon bond formation at the C-4 position of 3-acylaminoazetidinones and products and starting materials therefor
04/17/1990US4918184 Azetidin-2-one derivatives, and process for production thereof using tin enolates
04/17/1990US4918082 Anti-spasmodic agents containing quaternary nitrogen
04/11/1990EP0362902A2 Process and intermediates for beta-lactam antibiotics
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